Kvaser Hybrid CAN/LIN User’s Guide
14 (21)
D-SUB 9
CAN Function
LIN Function
1
Not connected
Not connected
2
CAN_L channel
Not connected
3
GND
GND
4
Not connected
Not connected
5
Shield
Shield
6
Not connected
Not connected
7
CAN_H channel
LIN_BUS channel
8
Not connected
Not connected
9
Not connected
Reference Voltage
Table 8: Pin configuration of the 9-pin D-SUB connector.
The Reference Voltage (pin 9) is only used as voltage reference and power to the
LIN transceiver. The Kvaser Hybrid CAN/LIN itself (including CAN transceiver) is
powered through the USB connector. The Reference Voltage (pin 9) must be
connected to a voltage supply in the range of 6 V to 27 V (absolute maximum rating
is 40V) to ensure proper behaviour of the transceiver. The Kvaser Hybrid CAN/LIN
will automatically switch the internal pull-up resistor from (typical) 160 k
Ω
to 1 k
Ω
when going from slave mode to master mode.
4.4
CAN bus termination
Every CAN bus must be terminated with a 120
Ω
resistor at each end of the bus.
The Kvaser Hybrid CAN/LIN does not contain any CAN bus termination, because
their inclusion could cause severe disturbance in a system which is already
correctly terminated.
For laboratory or testing use, the exact value of the termination resistors is not
critical. Sometimes a single terminator is sufficient. For production, proper
termination is essential. If you see error frames on the bus, you should check the
termination.
To save yourself a lot of trouble, always terminate the CAN
bus properly.
Kvaser AB, Mölndal, Sweden — www.kvaser.com
